Download Operating Manual - NY Tech Supply

Maintenance Instructions
CALIBRATING UL CIRCUIT
WARNING
Unlplug the unit before beginning any service work. Improper use or
connections can cause electrical shock. Only qualified personnel should
perform service work.
If the scale assembly and UL circuit are not calibrated, the scale can overfill
the tank, causing possible explosion and/or vehicle overcharge.
Live AC voltages are present in the unit when the power is turned on. use
caution when making the adjustments below.
The scale on the 700 series units will only handle a 50lb. tank. The UL circuit is a
tank overfill protection device. The main board is programmed to display FULL at
73 lbs. (33.11 kg.) the UL circuit is set as a back up fail safe to the programming.
Follow these steps to calibrate the circuit:
1. Remove all weight from the scale platform. Remove the shroud from the unit
by removing (3) screws. Also, be sure to remove the oil bottle by loosening (2)
screws.
2. Turn on the MAIN POWER switch.
NOTE: Press 0 to enter the pound or kilogram selection mode. Press ENTER to
toggle between lb. or kg. Press SHIFT/RESET and ENTER to accept the
displayed setting and exit mode.
3. Press SHIFT/RESET and ENTER at the same time.
4. Press 6 to display the absolute weight on the scale.
5. Place exactly 76 lbs. ± .01 lbs. (34.5kg. ± .005 kg.) on the scale and, with a
small screwdriver, adjust the P1-POT* (Potentiometer) until the display just
indicates HOLD.
6. Remove one pound from the scale and the HOLD segment should go off.
Press SHIFT/RESET to return to normal operations.
Series 17700A/17701A/34700/34701/34704 Enviro-Charge Units
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